I’m building a simple minting script and so far it’s working fine on testnet so my question is, will it also work fine on mainnet considering it will be a bit slower than on testnet?
That is the idea of testnet in a nutshell.
After thoroughly testing and debugging when everything works as desired you can point to mainnet to deploy the “real deal” with actual ADA instead of test tokens from the faucet. Note if you have hard-coded any test addresses, magic numbers, etc these will need to be swapped to real wallet addresses and values for payments etc. Mainnet should also be faster but if your code is dependent on timing of any kind to succeed I would highly suggest testing more first 
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That’s great, thanks!